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--______ we clean the classroom at once?
--No, you _____. You____ clean it after school.
A.Must, needn’t, mayB.Must, mustn’t, can
C.Shall, can’t, mustD.Need, mustn’t, may
A
考查情态动词.must必须,否定回答一般借助于needn’t或者don’t have to.shall一般用将来时态,need需要.句意:我们必须现在就打扫教室吗?不,你们不必。你们可以放学后在打扫。故选A。
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